Carrier synchronization system for coherent phase demodulators

Details Carrier synchronization system for coherent phase demodulators Carrier synchronization system for coherent phase demodulators

H - Electricity

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H04L 27/22 (2006.01) H04L 27/227 (2006.01) H04L 27/00 (2006.01)

Patent

CA 1085003

CARRIER SYNCHRONIZATION SYSTEM FOR COHERENT PHASE DEMODULATORS ABSTRACT A carrier synchronization system for a four-phase coherent PSK de- modulator in which the four-phase PSK signal is demodulated by an in-phase reference carrier and a quadrature reference carrier both of which are locally generated by a reference carrier source. The in-phase and quadrature components of the four-phase PSK signal that result from these demodulation operations are delayed a time inter- val substantially equal to T/2 seconds, T being the signalling period. The product of the delayed in-phase component by the sign of the quad- rature component is subtracted from the product of the delayed quad- rature component by the sign of the in-phase component to provide a phase error signal. This error signal controls the adjustment of the reference carrier source. - 1 -

287435

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